Solved: Remember that the bright lights covers most of their body?? That blocks most of the things. It may also safe to assume that their body emits pretty decent amount of light just to show their outline, but not as much as to show anything in plain sight.
GX Episode 13: How the heck could Chris accomplish such a stellar academic performance? She might be gifted and talented, but lacking 8 years of formal education, give-or-take, will surely degrade her academic capability. Obviously during 6 years being trafficked, she could not learn anything much, but 2 years with Fine is probably not enough to catch up with senior high-level material.
Solved: Remember, Chris is a long range fighter who has to take into account the wind and range of her weapons to make them the most effective and avoid friendly fire. Plus she came up with the plan to build up power to destroy the aerial noise when she joined Hibiki and Tsubasa during their first fight together. Then she made the gambit with Dr. Ver knowing that it would pay off despite the huge risks she took, and even let Tsubasa in on it in a way that didn't alert him to her true intentions, allowing her plan to work. It's safe to say at this point that Chris isn't just talented and gifted, she is incredibly clever and creative as well, so a few study sessions might have very well been all she needed to cram a lot of that knowledge into her head. Plus she takes her role as Kirika and Shirabe's senpai rather seriously, so she probably pushes herself to do a lot more work to inspire and motivate them.